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35 Cards in this Set
- Front
- Back
Line |
Unipolar, bipolar, and polar encoding are types of blank encoding |
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All of the above |
encoding has a transition at the middle of each bit |
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Differential Manchester |
encoding has a transition at the beginning of each 0 bit |
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Analog-to-digital |
PCM is an example of blank conversion |
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1200 samples/s |
If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highest frequency at 600 Hz, what should be the sampling rate, according to the Nyquist theorem? |
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Twice the highest frequency of a signal |
The Nyquist theorem specifies the minimum sampling rate to be |
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NRZ-L |
Which of the following encoding methods does not provide for synchronization? |
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AMI |
Which encoding method uses alternating positive and negative values for 1s |
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32 |
Which quantization level results in a more faithful reproduction of the signal? |
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A and B. Synchronization and error detection. |
Block coding can help in blank at the receiver |
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Parallel |
In blank transmission, bits are transmitted simultaneously, each across its own wire |
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A and B. Asynchronous serial and synchronous serial |
In blank transmission, bits are transmitted over a single wire, one at a time. |
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Asynchronous serial |
In blank transmission, a start bit and stop bit frame a character byte |
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Variable |
In asynchronous transmission, the gap time between bytes is |
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Digital to digital |
Blank conversion involves three techniques: line coding, block coding and scrambling |
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Line coding |
Blank is the process of converting digital data to a digital signal |
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Block coding |
Provides redundancy to ensure synchronization and inherent error detection |
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Block coding |
Is normally referred to as mB/nB coding; it replaces each m bit group with ab n bit group |
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Scrambling |
Provides synchronization without increasing the number of bits |
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AMI and NRZ |
Two common scrambling technique |
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PCM |
The most common technique to change an analog signal to digital data is called |
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Sampling |
The first step in PCM |
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Ideal, natural and flat top |
These are three sampling methods |
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PCM; DM |
Finds the value of the signal amplitude for each sample; blank finds the change from the previous sample |
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Asynchronous |
In blank transmission, we send 1 start bit(0) at the beginning and 1 or more stop bits (1s) at the end of each byte |
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Synchronous |
In blank transmission, we send bits one after another without start or stop bits or gaps. It is responsibility of the receiver to group the bits |
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Isochronous |
The blank mode provides synchronization for the entire stream of bits must. In other words, it guarantees that the data arrive at a fixed rate. |
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Self-synchronizing |
A blank digital signal includes timing information in the data being transmitted |
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Base |
In decoding a digital signal, the receiver calculates a running average of the received signal power, called the |
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Data; signal |
The blank rate defines the number of data elements sent in 1 s; the blank rate is the number of signal elements sent in 1s |
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Baud |
The signal rate is sometimes called the blank rate |
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Bit |
The data rate is sometimes called the blank rate |
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Unipolar |
In a blank scheme, all the signal levels are on one side of the time axis, either above or below. |
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NRZ-L |
In blank level of the voltage determines the value of the bit |
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Manchester |
The idea of RZ and the idea of NRZ-L are combines into the blank scheme |